CN221196018U - Labyrinth ventilation structure of planetary gear box - Google Patents

Abstract

The application provides a labyrinth ventilation structure of a planetary gear box, which relates to the field of gear boxes and comprises a front end plate, a baffle plate, a rear box body and a ventilation cap. The front end plate is provided with a first mounting side, the baffle is mounted on the first mounting side, and the baffle cooperate to define a first separation cavity; the rear box body is provided with a second installation side, the first installation side is in butt joint with the second installation side, the first installation side and the second installation side are matched to define a second separation cavity communicated with the first separation cavity, and the ventilation cap is arranged on the front end plate or the rear box body and is communicated with the second separation cavity; the front end plate and the rear box body are matched to define an oil pool, and the first separation cavity is communicated with the oil pool. The oil-gas separation is carried out before the oil-gas mixture reaches the ventilation cap, so that the load of the ventilation cap is reduced, the oil-gas separation effect is improved, and the oil leakage probability at the ventilation cap is reduced.

Description

Labyrinth ventilation structure of planetary gear box

Technical Field

The utility model relates to the field of gear boxes, in particular to a labyrinth ventilation structure of a planetary gear box.

Background

At present, the inside of an electric automobile planetary gear box depends on an oil guide rib and an oil guide groove to guide lubricating oil to the upper part of a bearing seat, so that the bearing arranged at the bearing seat is lubricated by the lubricating oil. In addition, because the peak rotating speed of the planetary gear box is higher, when the gear runs at a high speed, a high-temperature and high-pressure oil-gas mixture is formed in the box body of the gear box, and flows towards the position of the ventilation cap under the action of pressure, and oil-gas separation is carried out by means of the ventilation cap.

The inventor researches show that the existing electric planetary gear box has at least the following disadvantages:

Only adopt the ventilative cap to carry out oil-gas separation, the effect is poor, leads to appearing ventilative cap and oozes the problem of oil.

Disclosure of utility model

The utility model aims to provide a labyrinth ventilation structure of a planetary gear box, which can perform oil-gas separation before an oil-gas mixture reaches a ventilation cap, so that the load of the ventilation cap is reduced, the oil-gas separation effect is improved, and the oil leakage probability at the ventilation cap is reduced.

Embodiments of the present utility model are implemented as follows:

The utility model provides a labyrinth ventilation structure of a planetary gear box, which comprises the following components:

The front end plate is provided with a first installation side, the baffle is installed on the first installation side, and a first separation cavity is defined by the baffle and the baffle in a matched mode; the rear box body is provided with a second installation side, the first installation side is in butt joint with the second installation side and is matched with the second installation side to define a second separation cavity communicated with the first separation cavity, and the ventilation cap is installed on the front end plate or the rear box body and is communicated with the second separation cavity; the front end plate is matched with the rear box body to define an oil pool, and the first separation cavity is communicated with the oil pool.

In an alternative embodiment, the front end plate comprises an end plate and an annular insert plate which are of a one-piece structure, the first mounting side is arranged on a plate surface of the end plate, and one end of the annular insert plate is arranged on the first mounting side; the annular plugboard is spliced in the rear box body; the first separation cavity is located in an area surrounded by the annular inserting plate, and the second separation cavity is located outside the area surrounded by the annular inserting plate.

Based on above-mentioned scheme, front end plate adopts the cooperation of grafting mode with the back box, convenient assembling, and annular picture peg and the interior wall surface contact of back box, and the cooperation area is big, and overall structure is firm reliable after the assembly. The annular plugboard separates the first separation cavity and the second separation cavity, and the oil-gas mixture can enter the first separation cavity and then enter the second separation cavity, and the oil-gas mixture is difficult to directly enter the second separation cavity, so that the first separation cavity and the second separation cavity are more tightly matched, and the oil-gas separation effect is good.

In an alternative embodiment, a sealing ring is arranged between the annular insertion plate and the rear box body.

Based on the scheme, the sealing performance between the annular plugboard and the rear box body is better, the oil-gas mixture is not easy to leak from the connection position of the annular plugboard and the rear box body or directly enter into the second separation cavity, the operation safety and reliability are improved, and the separation effect of the oil-gas mixture is also improved.

In an alternative embodiment, the first mounting side is provided with an inlet groove and a first cavity groove, one side of the inlet groove is communicated with the first cavity groove, the other side of the inlet groove is communicated with the oil pool, and the baffle is attached to the first mounting side and seals the notch of the inlet groove and the notch of the first cavity groove simultaneously, so that the first cavity groove forms the first separation cavity.

Based on above-mentioned scheme, the interior space that first separation chamber utilized the front end plate forms, and the structure of front end plate is compact, and is small, and the space that occupies is little. Simultaneously, the first separation chamber is through import groove and oil bath intercommunication, and oil gas mixture needs to enter into the first separation chamber through import groove, has reduced the load of first separation chamber, and the oil gas separation in first separation chamber is effectual.

In an alternative embodiment, the inlet slot is provided as a wedge-shaped slot, the slot width of the inlet slot increasing gradually in a direction from one side closer to the first cavity slot to the other side.

Based on the above scheme, the import groove sets up to the gradual change groove, the bore of the port of import groove with the oil bath intercommunication is great, the bore of the port of import groove with the first separation chamber intercommunication is less, be convenient for utilize great port guide oil gas mixture to enter into first separation intracavity, and the surface area of the pore wall of import groove compares the pore wall of cylinder hole big, when oil gas mixture gets into first separation chamber through the import groove, the quantity of the fluid that is attached to on the wall of import groove increases, the fluid can fall back into the oil bath under the action of gravity, thereby improve the oil-gas separation effect.

In an alternative embodiment, a connecting channel is arranged on the front end plate, one end of the connecting channel is communicated with the first cavity groove, and the other end of the connecting channel is communicated with the second separation cavity.

Based on the scheme, after the primary separation of the oil-gas mixture in the first separation cavity, the oil-gas mixture enters the second separation cavity to be separated again through the guide of the connecting channel, so that the separation effect is improved.

In an alternative embodiment, the port of the connection channel communicating with the first cavity groove and the port of the connection channel communicating with the second separation chamber have a pitch in the thickness direction of the front end plate.

Based on the scheme, after the first oil-gas separation of the oil-gas mixture in the first separation cavity is finished, the oil-gas mixture enters the second separation cavity from the connecting channel, and the structural design of the connecting channel increases the distance of the oil-gas mixture entering the second separation cavity from the first separation cavity, prolongs the flowing time of the oil-gas mixture entering the second separation cavity from the first separation cavity, and can increase the oil quantity of oil in the oil-gas mixture flowing back to the first separation cavity under the action of gravity, so that the oil-gas separation effect can be improved.

In an alternative embodiment, the port of the connecting channel communicating with the first cavity slot is offset from the inlet slot.

Based on the scheme, the oil-gas mixture entering the first separation cavity from the inlet groove is not easy to directly enter the connecting channel, so that the running path and time of the oil-gas mixture in the first separation cavity can be prolonged, and the oil-gas separation effect is improved.

In an alternative embodiment, the second mounting side is provided with a second cavity groove, and the first mounting side closes the notch of the second cavity groove, so that the second cavity groove forms the second separation chamber.

Based on the scheme, the second separation cavity is formed by utilizing the inner space of the rear box body, and the rear box body is compact in structure, small in size and small in occupied space.

In an alternative embodiment, the rear case is provided with a mounting through hole, the mounting through hole is communicated with the second cavity groove, and the ventilation cap is inserted into the mounting through hole.

Based on the scheme, the ventilation cap is arranged on the rear box body, so that the ventilation cap is more stable to install, the thickness of the front end plate is not easy to increase, and the preparation cost of the front end plate is not easy to increase.

The embodiment of the utility model has the beneficial effects that:

In summary, in the labyrinth ventilation structure of the planetary gear box provided in this embodiment, during normal operation of the gear box, the planetary transmission mechanism inside the gear box agitates the lubricating oil during rotation, so that the lubricating oil can be conveyed to various positions to achieve a lubrication effect. Meanwhile, the temperature is higher when the planetary transmission mechanism operates, the lubricating oil is heated, the lubricating oil is evaporated to form gas, so that an oil-gas mixture is formed in the oil pool, and when the internal pressure is increased, the oil-gas mixture has a tendency of being discharged from the ventilation cap. When the inside oil gas mixture of oil pond reachs the ventilative cap before, through first separation chamber and second separation chamber in proper order, first separation chamber and second separation chamber cooperation carry out a lot of oil gas separation to the oil gas mixture to effectively improved the separation effect of oil gas mixture, make the oil liquid volume that reachs in the oil gas mixture of ventilative cap department reduce, the load of ventilative cap department is little, the difficult condition that leaks oil of appearance in ventilative cap department. And, first separation chamber and second separation chamber all utilize the inner space of front end plate and back box to form, and overall structure is compact, and is small, need not add unnecessary structure spare, and processing manufacturing is convenient, with low costs.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a labyrinth ventilation structure of a planetary gearbox according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a front end panel according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a front end panel from another perspective according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of a rear case according to an embodiment of the present utility model.

Icon:

001-a first separation chamber; 002-a second separation chamber; 003-oil pool; 004-oil gas enters the channel; 100-front end plate; 110-end plates; 111-a first cavity slot; 112-an inlet slot; 113-a communication hole; 1131-a first end; 1132-a second end; 120-annular plugboards; 130-an oil baffle rib plate; 140-an oil baffle; 200-baffle plates; 300-a rear box body; 310-a receiving groove; 320-a second cavity groove; 330-an air guide groove; 340-mounting through holes; 400-venting cap.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1 to 4, in the present embodiment, the labyrinth ventilation structure of the planetary gear box includes a front end plate 100, a baffle 200, a rear case 300, and a ventilation cap 400. The front end plate 100 has a first mounting side on which the baffle 200 is mounted and which cooperate to define a first separation chamber 001; the rear case 300 has a second mounting side, the first mounting side is abutted with the second mounting side and the first mounting side and the second mounting side cooperate to define a second separation chamber 002 communicated with the first separation chamber 001, and the ventilation cap 400 is mounted on the front end plate 100 or the rear case 300 and communicated with the second separation chamber 002; the front end plate 100 and the rear case 300 cooperate to define an oil pool 003, and the first separation chamber 001 communicates with the oil pool 003.

Based on the above technical scheme, the working principle of the labyrinth ventilation structure of the planetary gear box provided by the embodiment is as follows:

In the normal operation process of the gear box, the planetary transmission mechanism in the gear box stirs lubricating oil in the rotation process, so that the lubricating oil can be conveyed to various positions to realize a lubricating effect. Meanwhile, the temperature is high when the planetary transmission mechanism is operated, the lubricating oil is heated, the lubricating oil is evaporated to form gas, and thus an oil-gas mixture is formed in the oil pool 003, and when the internal pressure is increased, the oil-gas mixture has a tendency to be discharged from the air-permeable cap 400. When the inside oil gas mixture of oil pond 003 before reaching ventilative cap 400, through first separation chamber 001 and second separation chamber 002 in proper order, first separation chamber 001 and second separation chamber 002 cooperation carry out a lot of oil gas separation to the oil gas mixture to effectively improved the separation effect of oil gas mixture, make the oil liquid volume that gets into the oil gas mixture of ventilative cap 400 department reduce, the load of ventilative cap 400 department is little, the difficult condition that oozes the oil leak of appearance in ventilative cap 400 department. In addition, the first separation chamber 001 and the second separation chamber 002 are formed by utilizing the inner spaces of the front end plate 100 and the rear case 300, so that the overall structure is compact, the volume is small, redundant structural members do not need to be additionally arranged, the processing and the manufacturing are convenient, and the cost is low.

The following examples illustrate the details of the labyrinth ventilation structure of the planetary gear box provided by the application.

Referring to fig. 1-4, in this embodiment, optionally, the labyrinth ventilation structure of the planetary gear box includes a front end plate 100, a baffle 200, a rear case 300, and a ventilation cap 400. The front end plate 100 has a first mounting side on which the baffle 200 is mounted and which cooperate to define a first separation chamber 001. The rear case 300 has a second mounting side, the first mounting side and the second mounting side are abutted and cooperate to define a second separation chamber 002 in communication with the first separation chamber 001, the second separation chamber 002 being located outside the first separation chamber 001. The air-permeable cap 400 is mounted on the rear case 300 and communicates with the second separation chamber 002. The front end plate 100 and the rear case 300 cooperate to define an oil pool 003, and the first separation chamber 001 communicates with the oil pool 003.

So design, through the cooperation structure of first separation chamber 001, second separation chamber 002 and ventilative cap 400, oil gas mixture is through first separation chamber 001, second separation chamber 002 and ventilative cap 400 in proper order, can all carry out oil gas separation to oil gas mixture in first separation chamber 001, second separation chamber 002 and ventilative cap 400 department, realizes multistage separation, and oil gas mixture's separation effect is good, and the load of ventilative cap 400 department is little, is difficult for appearing the phenomenon of seepage oil.

Referring to fig. 2 and 3, in this embodiment, the front end plate 100 may optionally include an end plate 110 and an annular insert plate 120 that are connected. It should be appreciated that the annular insert plate 120 and the end plate 110 may be provided as an integral structure, which has high structural strength and is safe and reliable to use. One plate surface of the end plate 110 is a first installation side, on which a first cavity groove 111 and an inlet groove 112 are provided, and the first cavity groove 111 is located at an outer side of the inlet groove 112 in a radial direction of the end plate 110, that is, the first cavity groove 111 is located farther from a center position of the end plate 110 than the inlet groove 112. The first cavity groove 111 and the inlet groove 112 may each be an arc-shaped groove extending in the circumferential direction of the end plate 110. The groove depth directions of the first cavity groove 111 and the inlet groove 112 are both in the thickness direction of the end plate 110, and the groove depth of the first cavity groove 111 is greater than the groove depth of the inlet groove 112. Meanwhile, the annular insert plate 120 is located on the first installation side, the annular insert plate 120 and the end plate 110 are coaxially arranged, the annular insert plate 120 can be in inserted fit with the rear box 300, the contact area is increased, and the sealing performance and the combination firmness are improved. Meanwhile, in order to improve sealability, a sealing ring may be further provided between the annular insert plate 120 and the rear case 300. The first cavity slot 111 and the inlet slot 112 are both located in the area enclosed by the annular insert plate 120. The inside of the end plate 110 is also provided with a communication hole 113, one end of the communication hole 113 extends to the groove wall of the first cavity groove 111, and the other end penetrates the end plate 110 and the annular insert plate 120 and is located on the outer peripheral surface of the annular insert plate 120 and on the first mounting side of the end plate 110, through which communication hole 113 the first cavity groove 111 and the second separation chamber 002 can be communicated. The communication hole 113 may be a circular hole, an end of the communication hole 113 communicating with the first separation chamber 001 is a first end 1131, an end of the communication hole 113 communicating with the second separation chamber 002 is a second end 1132, the first end 1131 and the second end 1132 have a distance in an extending direction of an axis of the end plate 110, and a height of the first end 1131 is lower than a height of the second end 1132, for example, the first end 1131 is closer to a bottom wall of the first cavity groove 111 than the second end 1132. And, the first end 1131 is located between the bottom wall of the first cavity groove 111 and the bottom wall of the inlet groove 112, and the mixture of oil and gas entering from the inlet groove 112 does not directly enter into the communication hole 113. In other words, the port of the connecting channel, which communicates with the first cavity groove 111, is staggered with the inlet groove 112, so that the oil-gas mixture entering the first separation chamber 001 from the inlet groove 112 is not easy to directly enter the connecting channel, and the running path and time of the oil-gas mixture in the first separation chamber 001 can be prolonged, thereby improving the oil-gas separation effect.

Further, the inlet groove 112 is a gradual groove, and the groove width of the inlet groove 112 gradually increases in a direction from one end of the inlet groove 112 near the first cavity groove 111 to the other end, wherein the groove width direction of the inlet groove 112 coincides with the circumferential direction of the end plate 110.

Referring to fig. 3, in addition, an oil baffle plate 130 may be disposed on the first mounting side of the end plate 110, one side of the oil baffle plate 130 is in sealing connection with the inner peripheral surface of the annular insert plate 120, two oil baffle plates 140 are convexly disposed on the oil baffle plate 130, the two oil baffle plates 140 are arranged at intervals in the circumferential direction of the end plate 110, and the first cavity groove 111 is located between the two oil baffle plates 140. The oil blocking rib plate 130 can block the disturbed part of the lubricating oil and enable the lubricating oil to flow directly onto the front bearing seat, so that the lubricating area in the circumferential direction of the front bearing seat is increased. The end plate 110, the oil baffle rib plate 130 and the two oil baffle plates 140 can be integrally formed, and the design of the oil baffle rib plate 130 can prevent lubricating oil from directly entering the first separation cavity 001 and the inlet groove 112, so that the load of the first separation cavity 001 is reduced, and the oil-gas separation effect is improved.

It should be appreciated that the portion of the end plate 110 where the oil baffle rib plate 130 is provided has a thick thickness and a high strength, so that the structural strength of the end plate 110 is improved, and the first cavity groove 111 and the inlet groove 112 may be formed on the oil baffle rib plate 130, so that the strength of the end plate 110 is reduced, the volume of the first separation chamber 001 can be increased, and the oil-gas separation capability is improved.

In this embodiment, alternatively, the baffle 200 may be an arc-shaped plate, where the baffle 200 is assembled on the first mounting side of the end plate 110 and is located in the area surrounded by the annular insert plate 120, and the baffle 200 seals the notch of the first cavity groove 111 and the notch of the inlet groove 112, so that the first cavity groove 111 forms the first separation chamber 001, and the inlet groove 112 forms the oil gas inlet channel 004. Baffle 200 can the joint between two oil baffle 140, plays the effect of location, also can improve the fastness that combines to, baffle 200 sets up including baffle 130 protruding, baffle 130 shields baffle 200 and first cavity groove 111 confined position, and lubricating oil is difficult for entering into first separation chamber 001 from the notch department in first cavity groove 111, reduces the work load in first separation chamber 001, improves the oil-gas separation effect in first separation chamber 001. It should be noted that, because the inlet groove 112 is the gradual change groove for the oil gas entering channel 004 is the gradual change hole, the bore of the port of oil gas entering channel 004 that communicates with oil sump 003 is great, the bore of the port of oil gas entering channel 004 that communicates with first separation chamber 001 is less, the oil gas mixture in the oil sump 003 is conveniently introduced into first separation chamber 001 by using great port, and the surface area of the pore wall of oil gas entering channel 004 is big compared with the surface area of the pore wall of cylinder hole, when oil gas mixture passes through oil gas entering channel 004 and enters first separation chamber 001, the quantity of oil liquid attached to the wall of oil gas entering channel 004 increases, oil liquid can fall back into oil sump 003 under the action of gravity, thereby improve the oil gas separation effect. Meanwhile, since the first end 1131 of the communication hole 113 is located between the bottom wall of the first cavity groove 111 and the bottom wall of the inlet groove 112, or the first end 1131 and the bottom wall of the inlet groove 112 have a distance in the axial extending direction of the end plate 110, the oil gas inlet channel 004 and the first end 1131 of the communication hole 113 have a distance in the axial extending direction of the end plate 110, the oil gas mixture entering the first separation chamber 001 from the oil gas inlet channel 004 does not directly flow to the communication hole 113, but enters the communication hole 113 after oil gas separation in the first separation chamber 001, so that the time for the oil gas mixture to stay in the first separation chamber 001 is prolonged, and the oil gas separation effect is improved.

Referring to fig. 4, in this embodiment, optionally, the rear case 300 is provided with a receiving groove 310, an end surface of the receiving groove 310 where a notch is located is an annular end surface, and a second cavity groove 320 and an air guide groove 330 are disposed on the annular end surface, where the second cavity groove 320 may be an arc groove extending in a circumferential direction of the rear case 300. When the rear case 300 is docked with the front end plate 100, the annular insert plate 120 is inserted into the receiving groove 310, and the annular insert plate 120, the end plate 110 and the rear case 300 cooperate to define an oil pool 003. The first mounting side of the end plate 110 closes the notches of the second cavity groove 320 and the air guide groove 330 such that the second cavity groove 320 forms the second separation chamber 002. And, the second end 1132 of the communication hole 113 is butted and communicated with the air guide groove 330. The air-permeable cap 400 is mounted on the rear case 300 and communicates with the second separation chamber 002. Because the second cavity groove 320 is formed on the rear case 300, the inner space of the rear case 300 is utilized, and thus, the processing and manufacturing are facilitated, the overall structure is compact, and the assembly is facilitated.

Meanwhile, a mounting through hole 340 is provided on the peripheral wall of the rear case 300, the mounting through hole 340 is communicated with the second cavity groove 320, and the ventilation cap 400 is inserted into the mounting through hole 340.

The planetary gear box maze ventilation structure provided by the embodiment utilizes the inner space of the front end plate 100 and the rear box 300 to form the first separation cavity 001 and the second separation cavity 002, has compact overall structure and small volume, occupies small space, is favorable for assembly, performs oil-gas separation by matching the first separation cavity 001, the second separation cavity 002 and the ventilation cap 400, has good separation effect, does not need to set redundant parts for oil-gas separation, and reduces manufacturing cost.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A labyrinth ventilation structure of a planetary gear box, comprising:

The front end plate is provided with a first installation side, the baffle is installed on the first installation side, and a first separation cavity is defined by the baffle and the baffle in a matched mode; the rear box body is provided with a second installation side, the first installation side is in butt joint with the second installation side and is matched with the second installation side to define a second separation cavity communicated with the first separation cavity, and the ventilation cap is installed on the front end plate or the rear box body and is communicated with the second separation cavity; the front end plate is matched with the rear box body to define an oil pool, and the first separation cavity is communicated with the oil pool.

2. The planetary gearbox labyrinth ventilation structure as set forth in claim 1, wherein:

The front end plate comprises an end plate and an annular plugboard which are of an integrated structure, the first installation side is arranged on a plate surface of the end plate, and one end of the annular plugboard is positioned on the first installation side; the annular plugboard is spliced in the rear box body; the first separation cavity is located in an area surrounded by the annular inserting plate, and the second separation cavity is located outside the area surrounded by the annular inserting plate.

3. The planetary gearbox labyrinth ventilation structure as set forth in claim 2, wherein:

and a sealing ring is arranged between the annular plugboard and the rear box body.

4. The planetary gearbox labyrinth ventilation structure as set forth in claim 1, wherein:

The oil tank is characterized in that an inlet groove and a first cavity groove are formed in the first installation side, one side of the inlet groove is communicated with the first cavity groove, the other side of the inlet groove is communicated with the oil tank, and the baffle is attached to the first installation side and seals the notch of the inlet groove and the notch of the first cavity groove simultaneously so that the first cavity groove forms the first separation cavity.

5. The planetary gearbox labyrinth ventilation structure as set forth in claim 4, wherein:

The inlet groove is provided as a wedge-shaped groove, and the groove width of the inlet groove gradually increases in a direction from one side close to the first cavity groove to the other side.

6. The planetary gearbox labyrinth ventilation structure as set forth in claim 4, wherein:

the front end plate is provided with a connecting channel, one end of the connecting channel is communicated with the first cavity groove, and the other end of the connecting channel is communicated with the second separation cavity.

7. The planetary gearbox labyrinth ventilation structure as set forth in claim 6, wherein:

The port of the connecting channel, which communicates with the first cavity groove, and the port of the connecting channel, which communicates with the second separation chamber, have a pitch in the thickness direction of the front end plate.

8. The planetary gearbox labyrinth ventilation structure as set forth in claim 6, wherein:

The port of the connecting channel, which is communicated with the first cavity groove, is staggered with the inlet groove.

9. The planetary gearbox labyrinth ventilation structure as set forth in claim 1, wherein:

The second mounting side is provided with a second cavity groove, and the first mounting side closes the notch of the second cavity groove so that the second cavity groove forms the second separation cavity.

10. The planetary gearbox labyrinth ventilation structure as set forth in claim 9, wherein:

The rear box body is provided with a mounting through hole, the mounting through hole is communicated with the second cavity groove, and the ventilation cap is inserted into the mounting through hole.